Index | Use chart | 57 mm | 75 mm | 100 mm | 125 mm & 150 mm | Teardrop | Crossover | Mastbase Halyard Lead & Flip-Flop | Footblocks | AirRunners | Stainless Steel Runners | Opening Foot Blocks | Snatch | ESP Blocks | Stainless Steel ESP | Stainless Steel Blocks | Specifications

Big Boat blocks > 57 mm

Use 57 mm Black Magic AirBlocks on offshore boats. These strong, lightweight blocks are of sculpted aluminum, with Torlon rollers and carbon black balls for strength and UV protection. Rollers are housed in a unique center cage and isolated for less friction. Blocks feature a three-way head system and come in high and low load configurations.

Use for:

Control Lines

1951 1959

Three-way head system - swivels or can be locked Headpost rides on plastic bushing Three fasteners for quick disassembly Torlon roller bearings for strength and reduced wear Easy to open integral becket Low-load blocks have red isolators

1950 1958

1952 1960

1953 1961

1954

1965

3041

Part No.	Description	Sheave	Length		Weight w/shackle		Shackle pin		Max Line		Safe working load		Breaking strength
		mm	in	mm	oz	g	in	mm	in	mm	Ib	kg	Ib	kg
1950	Single/swivel/low-load	57	411/16	119	5.0	142	1/4	6	7/16	12	1655	750	3310	1500
1951	Single/swivel/low-load/becket	57	51/2	140	5.5	155	1/4	6	7/16	12	1655	750	3310	1500
1952	Double/swivel/low-load	57	53/16	132	10.1	286	5/16	8	7/16	12	2755	1250	5510	2500
1953	Double/swivel/low-load/becket	57	6	152	10.6	302	5/16	8	7/16	12	2755	1250	5510	2500
1954	Triple	57	53/16	132	13.2	375	5/16	8	7/16	12	4850	2200	9700	4400
1958	Single/swivel/high-load	57	411/16	119	5.0	142	1/4	6	7/16	12	2500	1134	5000	2268
1959	Single/swivel/high-load/becket	57	51/2	140	5.5	155	1/4	6	7/16	12	2500	1134	5000	2268
1960	Double/swivel/high-load	57	53/16	132	10.1	286	5/16	8	7/16	12	3600	1633	7200	3267
1961	Double/swivel/high-load/becket	57	6	152	10.6	302	5/16	8	7/16	12	3600	1633	7200	3267
1965	Stand-up/high-load*	57	41/2	114	7.4	210	1/4	6	7/16	12	2500	1134	5000	2268
3041	Straphead/high-load	57	35/16	84	3.6	102	1/4	6	7/16	12	2500	1134	5000	2268

* - ¹/₄" (6 mm)—Fastener circle: 1 15/₃₂" (37 mm)

Index | Use chart | 57 mm | 75 mm | 100 mm | 125 mm & 150 mm | Teardrop | Crossover | Mastbase Halyard Lead & Flip-Flop | Footblocks | AirRunners | Stainless Steel Runners | Opening Foot Blocks | Snatch | ESP Blocks | Stainless Steel ESP | Stainless Steel Blocks | Specifications